<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item><a href="#">商品管理</a></el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>

            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
           
            <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                        <el-cascader v-model="addForm.goods_cat" :options="catelist" @change="handleChange" :props="cateProps"> 
                        </el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                    <!-- 渲染表单的item项 -->
                    <el-form-item :label="item.attr_name" v-for="item in manyTabData" :key="item.attr_id">
                        <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                    <!-- action 上传的地址 -->
                    <el-upload
                        action="https://www.liulongbin.top:8888/api/private/v1/upload"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                    </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                    <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                    <!-- 添加商品按钮 -->
                    <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                </el-tab-pane>
            </el-tabs>

            </el-form>

            <!-- 图片预览 -->
            <el-dialog
                title="图片预览"
                :visible.sync="previewVisible"
                width="50%">
                <img :src="previewPath" class="previewImg">
            </el-dialog>

        </el-card>
    </div>
</template>

<script>
import _ from 'lodash'

export default {
    data(){
        return {
            // 步骤条高亮索引
            activeIndex:'0',
            // 添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                // 商品所属的分类数组
                goods_cat:[],
                // 图片的数组
                pics:[],
                // 商品的详情描述
                goods_introduce:'',
                attrs:[]
            },
            // 表单验证规则对象
            addFormRules:{
                goods_name:[
                    { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price:[
                    { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_weight:[
                    { required: true, message: '请输入商品重量', trigger: 'blur' }
                ],
                goods_number:[
                    { required: true, message: '请输入商品数量', trigger: 'blur' }
                ],
                goods_cat:[
                    { required: true, message: '请选择商品分类', trigger: 'blur' }
                ]
            },
            // 商品分类列表
            catelist:[],
            cateProps:{
                expandTrigger: 'hover',
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            // 动态参数列表数据
            manyTabData:[],
            // 静态属性列表数据
            onlyTabData:[],
            // 图片上传组件的heades请求头对象
            headerObj:{
                Authorization : window.sessionStorage.getItem('token')
            },
            // 预览图片的路径
            previewPath: '',
            previewVisible:false
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取商品分类
        async getCateList(){
            const {data:res} = await this.$http.get('categories')

            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类数据失败！')
            }

            this.catelist = res.data
            // console.log(this.catelist)
        },
        // 级联选择器选中项变化触发
        handleChange(){
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
            }
            
            // console.log(this.addForm.goods_cat)
        },
        beforeTabLeave(activeName,oldActiveName){
            // console.log(activeName +'--------'+oldActiveName
            // )
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请先选择商品分类！')
                return false
            }

        },
        async tabClicked(){
            // 证明访问的是动态参数面板
            if(this.activeIndex === '1'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{
                    sel:'many'
                }})
                if(res.meta.status !== 200){
                    return this.$message.error('获取动态参数失败！')
                }

                // console.log(res.data)
                res.data.forEach(item =>{
                    item.attr_vals = item.attr_vals.length === 0 ? [] :
                    item.attr_vals.split(' ')
                })
                this.manyTabData = res.data
            } else if(this.activeIndex === '2'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{
                    sel:'only'
                }})
                if(res.meta.status !== 200){
                    return this.$message.error('获取静态属性失败！')
                }
                // console.log(res.data)
                this.onlyTabData = res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file){
            // console.log(file)
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file){
            // console.log(file)
            // 1. 获取图片临时路径（参数file中）
            const filePath = file.response.data.tmp_path
            // 2. 从pics中找到对应索引
            const i = this.addForm.pics.findIndex( x => 
            x.pic === filePath)
            // 3. splice方法移除
            this.addForm.pics.splice(i , 1)
            // console.log(this.addForm)
        },
        // 监听上传成功的事件
        handleSuccess(response){
            // console.log(response)
            // 1. 拼接得到一个图片信息对象
            const picInfo = { pic : response.data.tmp_path }
            // 2. 将图片信息对象 push到pics数组中
            this.addForm.pics.push(picInfo)
            // console.log(this.addForm)
        },
        // 添加商品
        async add(){
            // console.log(this.addForm)
            this.$refs.addFormRef.validate( valid => {
                if(!valid){
                    return this.$message.error('请填写必要的表单项')
                }
            })

            // 执行添加的业务逻辑
            // lodash  cloneDeep(obj)
            const form = _.cloneDeep(this.addForm)
            form.goods_cat = form.goods_cat.join(',')
            // 处理动态参数
            this.manyTabData.forEach(item => {
                const newInfo = {
                    attr_id:item.attr_id,
                    attr_value:item.attr_vals.join(' ')
                }
                this.addForm.attrs.push(newInfo)
            })
            // 处理静态属性
            this.onlyTabData.forEach(item => {
                const newInfo = {
                    attr_id:item.attr_id,
                    attr_value:item.attr_vals
                }
                this.addForm.attrs.push(newInfo)
            })
            form.attrs = this.addForm.attrs
            console.log(form)

            // 发起请求添加商品 商品的名称必须是唯一的
            const {data:res} =  await this.$http.post('goods',form)
            console.log(res)
            if(res.meta.status !== 201){
                return this.$message.error('添加商品失败！')
            }

            this.$message.success('添加商品成功！')
            this.$router.push('/goods')
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }

            return null
        }
    }
}
</script>

<style lang="less" scoped>
    .el-checkbox{
        margin: 0 10px 0 0 !important;
    }
    .previewImg{
        width: 100%;
    }
    .btnAdd{
        margin-top: 15px;
    }
</style>